Power hoist attachment for tractors



y 9, 1938. s. s. MOORE 2,124,116

POWER X-IOIST ATTACHMENT FOR TRACTORS Filed Dec. 31, 1955 V 2 Sheets-Sheet 1 a T n. x m T w *1 m m I r '3 1; a l 1': m 1:

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ATTORNEY July 19, 1938. s. s. MOORE POWER HOIST ATTACHMENT FOR TRACTORS Filed Dec. 31, 1955 2 Sheets-Sheet 2 me 0 ,NN S s *m mm mm 2 a x X Patented July 19, 1938 POWER HOIST ATTACHMENT FOR I IRA CTORS Stanley 8. Moore, Stockton, Calif.

Application December 31, 1935, Serial No. 56,922

9 Claims.

This invention relates to hoist drum attachments for tractors, for the purpose of enabling the operation of scrapers and other implements attached to the tractor to be controlled therefrom. The principal object of my invention is to provide a device of this type, adapted to be mounted on the tractor and operated from the power take-off shaft thereof, by means of which the cable drum of the hoist may be held stationary, driven in a cable winding direction, or allowed'to run free to pay out the cable, by the selective operation of a single lever.

A further object of the invention is to produce a simple and inexpensive device and yet one which will be exceedingly effective for the purpose for which it is designed.

These objects I accomplish by means of such structure and relative arrangement of parts as I will fully appear by a perusal of the following specification and claims.

In the drawings similar characters of reference indicate corresponding parts in the several views: Figure 1 is a sectional elevation of my improved attachment.

Figure 2 is a fragmentary sectional plan of the same on the line 22 of Figure 1.

Referring now more particularly to the characters of reference on the drawings, the numeral i denotes a housing of suitable form having a flange 2 at its forward end for attachment against the transmission housing of a tractor about the opening provided therein for the usual power take-oil shaft.

Journaled in and projecting from the front end of the housing and adapted at its front end for connection to the take-off shaft of the tractor is the drive shaft 3 of the attachment, which terminates inside the housing in a spider disc 4.

Axially alined with but spread from the shaft 3 and projecting rearwardlytherefrom is a driven shaft 5, journaled in the rear end of the shaft 3 and in the rear end of the housing I. Rearwardly of the housing the shaft 5 carries a bevel pinion 6 meshing with a bevel gear 1 whose axis is vertical or at right angles to the shaft 5. The gear I is secured to a shaft 8 journaled at points above and below the gear in an auxiliary housing 9 secured to the rear end of the housing I. The

housings I and 9 are communicating and both are adapted to be maintained partially full of suitable lubricant. Secured on the shaft 8 above the housing 9 is a cable drum l0. Below and rigid with the drum and above the housing 9 is a brake drum ll having a split band 12 thereon.

The shafts 3 and 5 are operatively connected together for selective driving engagement by a planetary gear structure arranged as follows:

Disposed rearwardly of and spaced from the disc 4 is a ring l3 rigidly connected to said disc by bolts. Disposed between the disc and ring are gear units each comprising a gear l5 and another gear l6 rearwardly thereof and rigid therewith; each gear unit being mounted on an axial pin I! supported in the disc and ring. The gear l5 meshes with a pinion l8 secured on the driven shaft 5 while the gear [6 meshes with a pinion l9 formed on the hub of a brake drum 2|! turnably mounted on the shaft 5 and surrounding the gear units. This drum also has a split brake band 2| thereon.

By reason of this arrangement of parts it will be seen that if the drum 20 is held against rotation while the band I2 is released, the shaft 5 will be driven and the cable drum rotated, assuming of course that the drive shaft 3 is rotating, which it is as long as the tractor is in operation. If the drum 20 is released, and the band I2 is tightened the shaft 5 will remain stationary and the cable drum will be held against rotation. If both brake drums are released the cable drum is free to rotate by the unwinding pull of the cable thereon.

The necessary control of the brake bands to obtain the above results is effected as follows:

The split ends of the band l2 are provided with ears 22 facing the adjacent side of the drum 20. while the band 2| has similar ears 23 at the top. Projectingthrough these pairs of ears are parallel rods 24 and 25' respectively, which at one end are guided in rigid axially adjustable sleeves 26. These are mounted on the housing I and their inner ends form stops engaging one of the corresponding ears of the brake bands to prevent rotation thereof.

The rod 24 has adjustable nuts 21 thereon engaging the opposite ear 22; there being a compression spring 28 n the rod between the ears tending to force th same apart and spread or release the band l2. Beyond the nuts the rod 24 slidably projects through a cam element 29 fixed in a sleeve 30 which is secured to and projects beyond the side of the housing i opposite the sleeves 26. A heavy brake setting compression 'springzl is disposed about the rod between the nuts 21 and the element 29; said spring overcoming the relatively weak resistance offered by the spring 28.

outwardly of'the cam the rod is secured on the hub 32 of an upstanding operating lever 33, said hub being formed as a cam element 34 cooperating with the element 29. The elements 29 and 34 are shaped so that with the rotation of the lever in either direction from a normal brake setting position, the rod 24 will be both rotated and moved lengthwise in a. direction away from the adjacent ear 22 against the resistance of the spring 3|. This withdraws the nuts 2'! from contact with said ear 22, allowing the spring 28 to expand to release the brake band.

The rod 25 also has adjustable nuts 35 engaging the'ear 23 opposite the corresponding sleeve 26,'a compression spring 36 on said rod between the ears tending to force the same apart to release the band. Fixed on the rod 35 beyond the nuts is a cam collar 31, which cooperates with a cam element 38 formed on the inner end of a. sleeve 39 which is secured on and projects outwardly from the adjacent side of the housing I.

'The rod 25 turnably and slidably projects through the sleeve 39, in supporting relation, andon its outer end is mounteda hub 40 having a packing gland 4| cooperating with the adjacent end of the sleeve 39 to prevent leakage of lubricant from the interior of the housing. A relatively short arm 42 projects upwardly from the hub 40, on which is mounted an axially adjustable stop member preferably in the form of a set screw 43. This member projects toward the lever 33 and is substantially at right angles thereto, terminating short of said lever when the latter is in its normal position. The end of the screw 43 nearest the lever is adapted to be engaged by a pad 44 on said lever only when the latter is turned a certain amount in a corresponding direction from its normal position.

The cam elements 31 and 38 are arranged so as to cause the arm 42 to return to its normal position after having been once moved, and when the arm is in said normal upstanding position the band 2| is released. When the arm is turned from said position the rod 25 will be relatively advanced to cause the nuts 35 to push against the ear 23 and clamp the band 2| about the drum 20; the severity of the clamping pressure of course depending on the amount the rod 25 is rotated.

It will therefore be seen that as the lever 33 is turned so as to engage and move the stop 43, the drum band |2 will be released and the planetary gear band 20 will be clamped against rotation. The shaft will then be driven from the shaft 3 by reason of the intermediate planetary gears so as to drive the cable drum. The speed of rotation of said shaft 5 is of course dependent on the frictional pressure of the band 2| on the drum 20, which will be governed by the amount of movement of the lever 33. When the lever 33 is turned from its normal position in a direction away from the stop 43, the band l2 will again be released but the band 2| will not be tightened about its drum since the stop 43 will not be engaged by this movement of the lever. Both drums are then released, and neither the shaft 5 nor the cable drum will be driven; the latter being now free to rotate in a cable unwinding direction.

The cable drum being horizontally disposed (or having a vertical axis) and being mounted in the clear at the back end of the mechanism-enclosing housing, avoids the need of fair lead sheaves to guide the cable, and said cable can extend direct from the drum to the work.

From the foregoing description it will be readily seen that I have produced such a device as substantially fulfills the objects of the invention as set forth herein. 1

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described my invention, what I claim as new and useful and desire to secure by Letters Patent is:

1. A power hoist device comprising a cable drum, a normally set brake connected to the drum, drive means operable to rotate the drum, means to control the operation of said drive means and including a normally released brake the setting of which places such means in operation, means to release the drum brake including a turnable rod whose rotation in either direction effects such release, means to set the last named brake including a turnable rod whose rotation in one direction effects such setting, an operating lever projecting radially from the first named rod, and a member mounted in fixed connection with the other rod separate from and positioned to be engaged by-the lever to cause said other rod to be turned in said one direction when the lever is turned in one direction.

2. A power hoist device comprising a cable drum, a normally set brake connected to the drum, drive means operable to rotate the drum,

means to control the operation of said drive means and including a normally released brake the setting of .which places such means in operation, means to release the drum brake including a turnable rod whose rotation in either direction effects such release, means to set the last named brake including a turnable rod whose rotation in one direction effects such setting, said rods being parallel to each other, an operating lever projecting radially from the first named rod, an arm projecting radially from the other rod in the same direction as and substantially parallel to the lever, and a stop member mounted on said arm and extending substantially at right angles thereto toward the lever in position to be engaged at one end thereby with the movement of the lever in one direction from its normal position.

3. A structure as in claim 2, with means included with the setting means of the last named brake to cause the severity of the setting action to be determined by the extent of rotation of the corresponding rod.

4. A structure as in claim 2, with means included with the setting means of the last named brake to cause the arm and corresponding rod to return to their normal brake releasing position when the lever is retracted from engagement with the stop member.

5. A power hoist device comprising a cable drum, a brake structure connected to the drum and includirg a split brake band, a spring normally clamping the band about the drum, a rotatable longitudinally movable rod whose movement in one direction acts on the spring to relieve the band from the spring action, means mounted in connection with the rodto cause rotation thereof to also move the rod longitudinally in said one direction, means to thus rotate the rod, means operable to drive said driven shaft from the drive shaft, means to control the operation of said drive means and including a normally released brake the setting of which places such means in operation, and means operable by the rotation of the rod in one direction only to set the last named brake.

6. A power hoist device comprising a cable drum, a brake structure connected to the drum released brake the setting of which places such means in operation, means to thus set the brake including a rotatable rod, and means operable by the rotation of the first named rod in one direction to also rotate the last named rod.

'1. A power hoist device comprising a cable drum, a brake structure connected to the drum and including a split brake band, a spring normally clamping the band about the drum, a rotatable longitudinally movable rod whose movement in one direction acts on the spring to relieve the band from the spring action, means mounted in connection with the rod to cause rotation thereof to also move the rod longitudinally in said one direction, means to thus rotate the rod, means operable to drive said driven shaft from the drive shaft, means to control the operation of said drive means and including a normally released brake the setting of which places such means in operation, means to thus set the brake including a rotatable rod, and means operable by the rotation of the first named rod in one direction to also rotate the last named rod while enabling the first named rod tobe rotated in the opposite direction without rotating said last named rod.

8. A power hoist device comprising a drive shaft,- a driven shaft, 9. cable drum mounted thereon, a brake structure connected to the drum and including a split brake band, a spring normally clamping the band about the drum, a rotatable longitudinally movable rod whose movement in one direction acts on the spring to relieve the band from the spring action, means mounted in connection with the rod to cause rotation thereof to also move the rod longitudinally in said one direction, means to thus rotate the rod, normally inactive means to connect the driven shaft in driving relationship with the drive shaft, and means actuated by a rotation of said rod in one direction only to place said last named means in operation.

9. A power hoist device comprising a drive shaft, a driven shaft, a cable drum mounted thereon, a brake structure connected to the drum and including a split brake band having ears projecting from its ends, a fixed stop bearing against the outer face of one ear, a rod slidable through the ears at right angles" to the axis of the band, means on the rod engaging the outer face of the other ear, a compression spring about the rod pressing against said means to clamp the band against the drum, a fixed cam element through which the rod projects, a cooperating cam element on the rod, the elements being shaped to cause rotation of the rod in either direction from a predetermined position to retract the rod from and withdraw said means from the band ear, a lever to thus rotate the rod, normally inactive means to connect the driven shaft in driving relation with the drive shaft, and means actuated by a movement of the lever in one direction only to place such last named means in operation.

- STANLE S. MOORE. 

